Keith if you have all the parts on and it moves back a quarter inch than you dont have the fuel pump eccentric on correctly!! You must line the tab on the eccentric up with the key slot in the cam gear so the cam literly pulls through the eccentric to the washer and bolt.When installed correctly the cam should only move back and fourth a few thousandth. I can bet you dont have it lined up right and the cam isent pulling through the eccentric. I hope this helps you out.
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